乌鲁木齐机场近30年低能见度天气特征分析

应用乌鲁木齐机场30年(1981-2010)的观测资料,分析了该机场低能见度天气特征和变化趋势.结果表明:低能见度日数增长趋势明显；造成机场低能见度的主要天气是雾、浓烟和沙尘暴；95％的低能见度天气主要出现在冬半年,仅有5％的低能见度天气出现在夏半年；近年来大雾和浓烟日数明显增长,沙尘暴日数却明显降低,新疆地区气候向暖湿化的转化可能是出现这种变化的主要原因.

Analysis on the Climatic Characteristics of Low Visibility in 30 Years at Urumqi Airport

Based on the observation data in 30 years （1981-2010） at Urumqi Airport, the climatic characteristics and changes of low visibility are analyzed. The results show the escalation of increasing tendency of low visibility events is remarkable. The main factors causing low visibility are fog, smoke and sand storm. 95% of the low visibility events occur mainly in cold seasons while only 5% occur in warm seasons. Low visibility events caused by fog and smoke have increased, on the contrary, sand storm events have decreased. These changes should be attributed to the warm moist tendency of the climate in Xinjiang.